fix: keep path to event json file in composite actions (#1428)

* fix: keep path to event json file in composite actions

The event.json paths need to be copied over, since it the
GithubContext is recreated from the composite RC. And that
does read some value for the event file if available.

* test: add test case

* test: paste the test correctly and revert a line

Co-authored-by: ChristopherHX <christopher.homberger@web.de>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

act/runner/action_composite.go

@@ -69,6 +69,7 @@ func newCompositeRunContext(ctx context.Context, parent *RunContext, step action
 		Masks:        parent.Masks,
 		ExtraPath:    parent.ExtraPath,
 		Parent:       parent,
+		EventJSON:    parent.EventJSON,
 	}
 
 	return compositerc

act/runner/testdata/pull-request/main.yaml

@@ -5,6 +5,22 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - run: echo '${{github.ref}}' 
+      # test refs from event.json
+      - run: echo '${{github.ref}}'
       - run: echo '${{github.head_ref}}' | grep sample-head-ref
       - run: echo '${{github.base_ref}}' | grep sample-base-ref
+      # test main/composite context equality with data from event.json
+      - run: |
+          runs:
+            using: composite
+            steps:
+            - run: |
+                echo WORKFLOW_GITHUB_CONTEXT="$WORKFLOW_GITHUB_CONTEXT"
+                echo COMPOSITE_GITHUB_CONTEXT="$COMPOSITE_GITHUB_CONTEXT"
+                [[ "$WORKFLOW_GITHUB_CONTEXT" = "$COMPOSITE_GITHUB_CONTEXT" ]]
+              env:
+                WORKFLOW_GITHUB_CONTEXT: ${{ tojson(tojson(github.event)) }}
+                COMPOSITE_GITHUB_CONTEXT: ${{ '${{tojson(github.event)}}' }}
+              shell: bash
+        shell: cp {0} action.yml
+      - uses: ./